|
|
PDF SKY87201-11 Data sheet ( Hoja de datos )
| Número de pieza | SKY87201-11 | |
| Descripción | Fast Transient 600 mA Step-Down Converter | |
| Fabricantes | Skyworks Solutions | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SKY87201-11 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
DATA SHEET
SKY87201-11: Low Noise, Fast Transient 600 mA Step-Down
Converter with Output Auto Discharge
Applications
Cellular phones
Digital cameras
Handheld instruments
Microprocessor, DSP Core, I/O power
PDAs and handheld computers
USB devices
Features
Output auto discharge when disabled
VIN range: 2.7 V to 5.5 V
Low-noise, light-load mode
Low ripple power management mode
Output voltage adjustable from 0.6 V to VIN
No load quiescent current: 37 μA
Up to 98% efficiency
Maximum output current: 600 mA
Switching Frequency: 2 MHz
Soft start: 150 μs
Fast load transient
Over-temperature protection
Current limit protection
100% duty cycle low-dropout operation
Shutdown current: <1 μA
Available in an STDFN (8-pin, 2 x 2 mm) package
(MSL1, 260 C per JEDEC J-STD-020)
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Description
The SKY87201-11 is a 2 MHz step-down converter with an input
voltage range of 2.7 V to 5.5 V and output voltage as low as 0.6 V.
It is optimized to react quickly to a load variation. The SKY87201-
11 incorporates a unique low-noise architecture that reduces
ripple and spectral noise.
The SKY87201-11 is programmable with external feedback
resistors. It can deliver 600 mA of load current while maintaining
a low 37 μA no-load quiescent current. The 2 MHz switching
frequency minimizes the size of external components while
keeping switching losses low.
The SKY87201-11 is designed to maintain high efficiency
throughout the operating range, which is critical for portable
applications.
The device has an output auto discharge feature. This enables the
device to quickly discharge the output when the device is
disabled (VEN = VIN to 0 V).
The SKY87201-11 is provided in a small, 8-pin, 2 x 2 mm Thin
Dual Flat No-Lead (STDFN) package.
A typical application circuit diagram is provided in Figure 1. The
pin configuration and package are shown in Figure 2. Signal pin
assignment and functional pin descriptions are provided in
Table 1. A functional block diagram is shown in Figure 3.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201856G • Skyworks Proprietary Information • Products and Product Information Are Subject To Change Without Notice • October 9, 2013
1
1 page  
DATA SHEET • SKY87201-11 LOW-NOISE STEP-DOWN CONVERTER
Table 3. SKY87201-11 Electrical Characteristics (Note 1)
(TA = –40 C to +85 C [Typical Values @ +25 C, VIN = 3.6 V], Unless Otherwise Noted)
Parameter
Symbol
Test Conditions
Minimum
Step-Down Converter
Input voltage
Under Voltage Lockout threshold
Output voltage tolerance
Output voltage range
Quiescent current
Shutdown current
P-channel current limit
High side switch on resistance
Low side switch on resistance
Line regulation
Output threshold voltage accuracy
Output leakage current
Output impedance
Start-up time
Oscillator frequency
Over-temperature shutdown threshold
Over-temperature shutdown hysteresis
VIN
VUVLO
VOUT
VOUT
ICQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ΔVLINEREG
VOUT
IOUT
ROUT
TS
fOSC
TSD
THYS
VIN rising
Hysteresis
VIN falling
IOUT = 0 mA to 600 mA,
VIN = 2.7 V to 5.5 V
No load
EN = AGND = PGND
VIN = 2.7 V to 5.5 V,
IOUT = 600 mA
0.6 V output, No load,
TA = 25 C
0.6 V output
>0.6 V output
From enable to output
regulation
TA = 25 C
2.7
1.8
–3
0.6
800
591
250
0.9
Enable
Enable threshold low
Enable threshold high
Input low current
Output discharge time
VEN(L)
VEN(H)
IEN
TDISCHARGE
VIN = VOUT = 5.5 V
VIN = 3.0 V to 5.5 V,
VEN = VIN to 0 V,
VOUT = 3.0 V to 0.4 V,
L = 4.7 μH
COUT = 22 μF
1.4
–1
Typical
Maximum
5.5
2.7
100
+3
VIN
37 70
1
0.35
0.30
0.1
600 609
0.2
150
2.0 2.6
140
15
0.6
+1
25
Units
V
V
mV
V
%
V
μA
μA
mA
Ω
Ω
%/V
mV
μA
kΩ
μs
MHz
C
C
V
V
μA
ms
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201856G • Skyworks Proprietary Information • Products and Product Information Are Subject To Change Without Notice • October 9, 2013
5
5 Page 
DATA SHEET • SKY87201-11 LOW-NOISE STEP-DOWN CONVERTER
Evaluation Board Layout
The SKY87201-11 Evaluation Board is used to test the
performance of the SKY87201-11 Step-Down Converter. An
Evaluation Board schematic diagram is provided in Figure 27.
Component values for the SKY87201-11 Evaluation Board are
listed in Table 4. Typical surface mount inductors and capacitors
are listed in Tables 5 and 6, respectively. Table 7 provides the Bill
of Materials (BOM) for Evaluation Board components.
The suggested PCB layout for the SKY87201-11 is shown in
Figures 28 and 29. The following guidelines should be used to
help ensure a proper layout.
1. The input capacitor (C1) should connect as close as possible
to VIN and PGND.
2. C2 and L1 should be connected as close as possible. The
connection of L1 to the LX pin should be as short as possible.
3. The feedback trace or OUT pin should be separate from any
power trace and connected as close as possible to the load
point. Sensing along a high-current load trace degrades DC
load regulation. If external feedback resistors are used, they
should be placed as close as possible to the OUT pin to
minimize the length of the high impedance feedback trace.
4. The resistance of the trace from the load return to PGND
should be kept to a minimum. This helps to minimize any
error in DC regulation due to differences in the potential of the
internal signal ground and the power ground. A high density,
small footprint layout can be achieved using an inexpensive,
miniature, non-shielded, high DCR inductor.
Input
Voltage
C1
4.7 μF
GND
6 VIN
8
EN
× 1 N/C
4 PGND
LX 5
7
OUT
N/C 2 ×
AGND 3
Output
L1 Voltage
4.7 μH
R1
118 kΩ
C3
DNI
C2
4.7 μF
R2
59 kΩ
GND
VIN
JP1
1
2
3
EN
GND
GND
Figure 27. SKY87201-11 Evaluation Board Schematic
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201856G • Skyworks Proprietary Information • Products and Product Information Are Subject To Change Without Notice • October 9, 2013
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SKY87201-11.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SKY87201-11 | Fast Transient 600 mA Step-Down Converter | Skyworks Solutions |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |